Fix HMR issue with webpack-stats-analyzer (#1149)

* Use stats.json instead of running server

* Add suggested changes

examples/with-webpack-bundle-analyzer/README.md

@@ -7,7 +7,7 @@ Download the example [or clone the repo](https://github.com/zeit/next.js):
 
 ```bash
 curl https://codeload.github.com/zeit/next.js/tar.gz/master | tar -xz --strip=2 next.js-master/examples/with-webpack-bundle-analyzer
-cd hello-world
+cd with-webpack-bundle-analyzer
 ```
 
 Install it and run:
@@ -26,3 +26,5 @@ now
 ## The idea behind the example
 
 This example shows how to analyze the output bundles using [webpack-bundle-analyzer](https://github.com/th0r/webpack-bundle-analyzer#as-plugin)
+
+To view the stats use `npm run bundle:view`

examples/with-webpack-bundle-analyzer/next.config.js

@@ -4,11 +4,11 @@ module.exports = {
     // Perform customizations to config
     config.plugins.push(
       new BundleAnalyzerPlugin({
+        analyzerMode: 'disabled',
         // For all options see https://github.com/th0r/webpack-bundle-analyzer#as-plugin
-        analyzerMode: 'server',
-        analyzerHost: '127.0.0.1',
-        analyzerPort: 8888,
-        openAnalyzer: false
+        generateStatsFile: true,
+        // Will be available at `.next/stats.json`
+        statsFilename: 'stats.json'
       })
     )
     // Important: return the modified config

examples/with-webpack-bundle-analyzer/package.json

@@ -1,10 +1,11 @@
 {
-  "name": "hello-world",
+  "name": "with-webpack-bundle-analyzer",
   "version": "1.0.0",
   "scripts": {
     "dev": "next",
     "build": "next build",
-    "start": "next start"
+    "start": "next start",
+    "bundle:view": "webpack-bundle-analyzer .next/stats.json"
   },
   "dependencies": {
     "next": "beta",